[capdeck]

I used to work in a company that had part of the process written in Lisp and it was in true production. Once the (fp) guy left the company everyone else had to support that code. What a nightmare that was. No one wanted to touch it with a ten foot pole. Should we had another FP guru in our midst, that may have turned out differently. But everyone was in agreement that that part needs to be rewritten in a language that everyone else is using. In real life - if most stuff in your company is FP and there is plenty of expertise to go around - do FP. If not - do not. :-)

[Qwertystop]

Arguably, if you knew that A: there was code in Lisp and B: only one person knew how to support it, they should have either rewritten it while the one who understood it was still there, or had more people learn Lisp, or hired more people who knew Lisp. It shouldn't have been allowed to reach the point where someone quit without anyone else having a clue.